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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="drdna"] However, there is something to be said for the certain magic that can sometimes happen with a particular device. The unpredictable transients and color shades add a sense of alive-ness that seems separate from the standard charac...
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Hi,[quote user="Romy the Cat"]This subject of digital crossovers became quite popular during last few years and many audio-people give up and go for a simplicity and painlessness of digital crossovering.[/quote]Well, digital X-Overs would appear to o...
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The greatest thing that happened to my Yamaha B2 amp was the fact that I got rid of my MiniMe ported bass section. The MiniMe is truly nice now and I operate in the highly desirable not annoying status. That all made me to pay more attention to w...
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In the TAS that I bought because the Lamm ML3/LL1 review I found Jim Smith add about a new Engström & Engström Lars amp from Sweden. Jim tells the story about the Engströms and about the 20 Lars’s rules that reportedly assure “good sound”. Th...
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This thread has been pretty interesting overall. I've read most of it and would at least like to provide some feedback on the technical side of designing with the 45 and 2A3 DHTs... at least from my personal experience. A few years back I decid...
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Thank you for the comment on this amp, this is my first time of using the 6C33C tube, I decided to build this amp after reading about the Melquiades, this amp is just a quick experiment on the 6C33C sound, since I have...
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[quote user="Romy the Cat"] It did not last long….
Just a couple days back I was thinking that I will live with my current lower bass for a while and now I feel that I will not. I do not feel that my current ULF is wrong. In fact I feel that ...
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[quote user="hagtech"] I run the driver tube at 170V @20mA. I don't think you need to run this tube at high current. It is very linear with wide signal swings at this bias. [/quote]
Good operation points for use it as a driver. You might...
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Sine I informed public about Melquiades amplifiers I receive many emails from people asking me about the operation points of 6C33C. For whatever reasons people mistakably took me for some kind of 6C33C guru, which is am not. Moreover I could be hardl...
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I do not know how about 5dB attenuation
via cable but for sure cables sound very different. Hey you are talking to a person
who have a small fortune spent for wiring my entire system with vintage Dominos
and I never felt that it was waste of money...
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[quote user="Romy the Cat"] There is no aspects of minimization
of the inductor size. You can go to 30K, or 50K, or 100K input LPAD. The LPAD (which
is not inductive switched attenuators with good resistors) anyhow sites behind
the filter, so the ...
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It is nice to see you around, Jim.
A few comments. C1 in my phonostage is .28uF. The higher values were a proposal of Anagnostopoulos. I understand what he is coming form and yes my output stage of power amps will be able to handle the ULF stress. I...
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[quote user="Romy the Cat"]I think it takes around 60 seconds on my amps. I have 2 minutes delay for high voltage, so it all within the limit. [/quote]
That is good to know Romy. It was quite frustrating when I tho...
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[quote user="Romy the Cat"]I think to conduct any more or less methodologically cleaner experiment the best would be to have the field coil with multiple taps. Make the coil standard 600V rated and to design the coil to have let say 4 taps that ident...
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There are many ways to deal with EAR-843PT. To my ears it works wonderfully, this in my case it coupled with Expressive Technologies ET2 transformer that probably takes in totally new league. I kind of so addicted to this transformer that I even run ...
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[quote user="genesis168"]I am a owner of an ET SU-1 and would like to know what phono stage would go best with it. Would a Lamm LP2 be a good match?Will be using a Dynavector XV1s with it. Thanks in advance[/quote]It is truly an interesting question....
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First off, I forgot to mention an interesting observation: Before running the sweeps (previous post), since the drivers in the upper-bass horns are new, I decided to verify/optimize rear chamber volume (they are easily adjustable)... I wasn't expecti...
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[quote user="k100"] If I were to try to find a pair of ML2's that are older production, what years of production does this include? [/quote]
All ML2.1 are the new version of ML2 and they are not good as ML2. However, I have seen the original ML2 mar...
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Romy wrote :
"...You have too much gain in your playback for 109dB sensitivity... I used ML2 with 109dB sensitively and L2 with 12.5dB voltage divider at ML2 and I had no annoying noise at nearfiled..."
Ok so I made a couple voltage dividers fo...
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[quote user="KOTriode"] Without regulation, this amp would not work correctly due to its design: DC coupled and fixed bias. The high transconductance will make the bias current varied as much as 50-100ma due power line fluctuation without the reg...
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The voltages on the schematics are the actual live voltages driving a full power 5000kHz. The next 10mV at input clip the amp. I do not know yet what clip first’ driver stage, output stage of any of transformers. Anyhow, the full power set as a f...
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A couple months back I sent to Dima a link with a wonderful collection of audio articles from first part of the 20s century:
http://www.one-electron.com/Misc_Docs.html
In next couple days, talking with Dima he asked me: “Roma, what is REL Company a...
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5) You might consider do not make a dedicated PS for positive bias but to take it via a resistor right from C2 capacitor. I did it and I did not see any worsening in sound.
...
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[quote user="anthony"]Romy, I
appreciate that this is an old thread now and that you may not remember
everything from your time developing these amplifiers, but I have a (hopefully)
simple question about the upperbass crossover in the schematic ab...
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These thoughts come in the wake of Romy’s recent encounter with a certifiable fringe dweller who, IMO, is not just illustrative in the generic hi-fi nutbag sense, but also in the there’s-more-to-this-nutbag-than-his-worst-would-suggest sense. B...
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Part 2 – Description and explanation
Anyone who have ears and a rudimental mind to understand what ears register, and anyone among them who played with MF channels driven by SET, know that subject of SET loading is imperative.
Let take for...
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[quote user="Romy the Cat"]
cv wrote:
I wonder if it is the reactive components (blocking caps etc) that are to blame here, seeing as much of the problem is in the lower bass.Chris, what you said made me to think.
Loo...
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To answer the question WRT reliability.
I have built wholly switched mode amps with 2A3, 300B and now a 45.
I
also have a DAC 44...
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There
are some commercial preamps that have sub 10R output: Karana, Quicksilver,
Rogueaudio and many others. Some of them will ship the units to you to try. It
might be good to experiment with them. To have you local guy who will work with
you is...
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You decided to go with mA or are they mV against 1R resistors?
I prefer the second approach personally and I feel that I can moderate the quality
of resistor and I can’t moderate the quality of the milliampere meter coil.
The whole thing looks l...
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